Students and teachers keep finding hidden messages shoved into books in a college library in Ontario, Canada. The most disconcerting part? No one knows what the messages mean or where they came from. But, if you can figure it out, a professor at the college will give you $100. There are 18 coded notes, and they’ve all been found in Western University’s Weldon Library. There are 50 different symbols on each note, so either it’s an incredibly advanced code, or the notes might not even be in English. It's pretty weird!